Capnography: In addition application of capnography during deep sedation with propofol is performed. Before the trial starts, all nurses qualified in patient sedation management and abortion doctors will be trained in assessment of capnography. In the capnography arm, patients' breathing is additionally monitored with capnography. If alveolar hypoventilation is detected medical staff will intervene by arousing the patient, performing chin lift, repositioning the head, provision of oxygen, or abandon from giving additional propofol. These interventions represent the standard of care currently used by the clinical staff to respond to hypoventilation and hypoxemia.